Benchmark: Some vs. findIndex 3

Script Preparation code:

var testArray = [];

for (var i = 0; i < 20000; i++) {
  testArray.push({ id: i, text: 'a' });
}

testArray[9999].text = 'b'

Tests:

some
testArray.some(item => item.text === 'b');
findIndex
testArray.findIndex(item => item.text === 'b');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
some
findIndex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Measuring performance is an essential part of developing efficient software, and BenchmarkThat.net provides a useful tool for JavaScript developers to compare different approaches.

The provided benchmark definition json represents two test cases: `some` and `findIndex`. The script preparation code generates a large array of 20,000 objects with the same properties. Then, it changes the text property of the last object (index 9999) to 'b'.

Let's analyze what is being tested in these two test cases:

**1. some**

This test case uses the `some()` method, which returns `true` as soon as the callback function finds a true value. In this case, the callback function checks if the text property of an item is equal to 'b'. The goal is to measure how fast the browser can execute this method.

**Pros:**

* Easy to understand and implement
* Fast iteration over the array (no need to keep track of indices)

**Cons:**

* May not be suitable for larger arrays or more complex callback functions
* Can be slower if the callback function has side effects (e.g., modifying the array)

**2. findIndex**

This test case uses the `findIndex()` method, which returns the index of the first element that satisfies the callback function. In this case, the callback function checks if the text property of an item is equal to 'b'. The goal is to measure how fast the browser can execute this method.

**Pros:**

* Efficient for larger arrays (only iterates over elements until it finds a match)
* Suitable for more complex callback functions

**Cons:**

* May be slower than `some()` for small arrays
* Can be slower if the callback function has side effects (e.g., modifying the array)

Other alternatives to these methods include:

* Using a for loop with an index variable (`for (var i = 0; i < testArray.length; i++) { ... }`)
* Using `every()` and `some()` together (`testArray.some(item => item.text === 'b' && testArray.every(otherItem => otherItem.id !== 9999))`)

Regarding the libraries used in this benchmark, there is no explicit mention of any. However, it's likely that the browser being tested has its own implementation of these methods.

As for special JavaScript features or syntax, none are explicitly mentioned.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 14909.100.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser/OS: Chrome 104 on Chrome OS 14909.100.0

View result in a separate tab

Test name	Executions per second
some	3116.1 Ops/sec
findIndex	3022.6 Ops/sec

Related benchmarks:

Some vs. findIndex 3 (version: 0)

Comparing performance of: some vs findIndex

Created: 2 years ago by: Guest

Jump to the latest result

some

findIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):